Modelling UHF Propagation for Frequency Assignment in Radio Relay Networks,
FYSISCH EN ELEKTRONISCH LAB TNO THE HAGUE (NETHERLANDS)
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An account is given of experiences in developing UHF-propagation models for the terrain of the North German plain which is characterised by woods and farmland. A few empirical results on the relevance of modelling the interaction between diffraction and groundwave propagation are discussed. However, the paper mainly focusses on statistical methods used to select appropriate models, rather than going into the physical details of propagation mechanisms. Since local variability of the field strength prohibits prediction of the feasibility of radio relay links with absolute reliability, static diversity tests are recommended to avoid antenna positioning in local multipath nulls. It is shown that such antenna position tests are only worthwhile if the propagation model forecasts local mean signal powers with sufficient reliability.
- Radiofrequency Wave Propagation
- Radio Communications